Braking on IS350
07-18-07, 03:36 PM
#1
Braking on IS350
Guys is this normal for the brakes to make a jeking motion when i apply the brake light. When ever im driving and im going around 40-50 Mph and when i apply the brake i feel a jerking motion then i feel the gears going down then ill feel another softer jerk. IS this normal or are the brkaes supposed to do this since its a sports car. Im not annoyed by it but i actually like the jerk but yet again is something that i should get checked out??
07-18-07, 03:42 PM
#2
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The jerking is the engine braking caused by the ECU adapting to your driving style. It does this by keeping the transmission in a lower gear, just in case you have the need to brake, then instantly accelerate.
07-18-07, 04:27 PM
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Thanks for the info. CL comes thu again.
07-18-07, 04:38 PM
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If there is nothing wrong within your front end, bearings, and brake system... you prolly just need those front rotors to be re-surfaced (if thickness stands within spec), it will be $100 more or less...
If this problem is on going for a while already, you prolly need to change pads and rotors... that will be... $500 +/- maybe with oe parts.
If this problem is on going for a while already, you prolly need to change pads and rotors... that will be... $500 +/- maybe with oe parts.
07-18-07, 06:23 PM
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This may not be what youre refering to but the car also has the brake assist. I sometimes find myself trying to brake gently and the brake assist progressively starts applying more braking, sometimes more than i want. I've kind of gotten used to it now, the hard part is going back to my other car that doesnt have it.
07-19-07, 02:40 PM
#7
This may not be what youre refering to but the car also has the brake assist. I sometimes find myself trying to brake gently and the brake assist progressively starts applying more braking, sometimes more than i want. I've kind of gotten used to it now, the hard part is going back to my other car that doesnt have it.
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07-19-07, 03:55 PM
#8
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It's not brake assist. Brake assist kicks in only during a panic stop, and applies the brakes full force. Here is a description of the system from Lexus: http://www.lexus-europe.com/technolo..._IS_250#active
If you keep your center display in the "current gear" indicator mode, you'll see that the "jerks" you feel are not the brakes at all, but actually the car downshifting.
If you keep your center display in the "current gear" indicator mode, you'll see that the "jerks" you feel are not the brakes at all, but actually the car downshifting.
Last edited by Bichon; 07-19-07 at 03:59 PM.
07-19-07, 04:40 PM
#9
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Guys is this normal for the brakes to make a jeking motion when i apply the brake light. When ever im driving and im going around 40-50 Mph and when i apply the brake i feel a jerking motion then i feel the gears going down then ill feel another softer jerk. IS this normal or are the brkaes supposed to do this since its a sports car. Im not annoyed by it but i actually like the jerk but yet again is something that i should get checked out??
Cheers,
Old Oiler
07-19-07, 05:24 PM
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